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Former Miami Dolphins offensive lineman Jonathan Martin forced a Los Angeles-area high school to close Friday after making a cryptic post on Instagram, the New York Post reports.

Martin was viciously harassed by a number of his Dolphins teammates, including Richie Incognito and Mike Pouncey, starting in his rookie year in 2012, an NFL report released in 2014 found. The report concluded that the harassment eventually led “to Martin’s decision to leave the team, as well [as] contribute[d] to his mental health and suicidal thoughts,” SB Nation reports.

Martin used his private Instagram account to post a photo of a shotgun and bullets, as well as the names of former teammates, including Incognito and Pouncey. He also included the name of the high school he attended, Harvard-Westlake, and the text: “When you’re a bully victim and a coward, your options are suicide or revenge.”

In the 2014 NFL report, Martin had also expressed distress over being “a pushover, a people-pleaser,” texting friends and family to say: “I mostly blame the soft schools I went to, which fostered within me a feeling that I’m a huge p–sy, as I never got into fights. I used to get verbally bullied every day in middle school and high school, by kids that are half my size.”

In a statement, the school said: “Last evening, we learned of an internet post that mentions Harvard-Westlake by name. Out of an abundance of caution, and because the safety of our students, faculty, and staff is our top priority, we made the decision to close school today. We are working closely with law enforcement and will share more information when we are able.” Jeva Lange